Flight Kansai International Airport departs from Osaka Kansai International Airport at 21:20 and arrives at Beijing Daxing International Airport at 00:05.
The flighttime is about 3h 45m. The distance travelled ("as the bird flies"): 2118 Km. So the average speed is roughly 565 Km.
There is an 1 hour time difference between Osaka and Beijing
